Fig. 3
From: Stereological study of organelle distribution in human mature oocytes
Ultrastructural images of metaphase-II oocytes. (A) Delimitation of the three oocyte regions, cortex (C), subcortex (SC) and inner cytoplasm (IC). (A-C) Oocyte cortex. (A, C) Oocyte subcortex. (D-F) Oocyte inner cytoplasm. Cortical vesicles (cv) accumulate under the oolemma but are also observed isolated in the cortex and subcortex. The ooplasm is rich in mitochondria (mi), smooth endoplasmic reticulum (SER) small (SV), medium (MV) and large (LV) vesicles, SER isolated tubules (IT) and SER small tubular aggregates (*). Lysosomes (Ly), rich in lipid droplets (L), were observed only in the inner cytoplasm. ZP: zona pellucida; pvs: perivitelline space; mv: microvilli. Bars: (A, B, C, D, E, F) 1 μm.
